Nearly 18,000 people were killed in terrorist-related incidents last year, a 60% increase from the previous year, a new study found. Deaths have increased five-fold since 2000.

The report, compiled by the Institute for Economics & Peace, attributes the increased terrorist activity to the growing influence of “radical Islamic groups.” Two thirds of the fatalities came at the hands of ISIS, Boko Haram, al-Qaeda and the Taliban, the report said.

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